Which pair of compounds does not show the law of multiple proportions

1. A.
   $\text{CuO},\ \text{Cu}_2\text{O}$
2. B.
   $\text{NaNO}_3,\ \text{CaCO}_3$
3. C.
   $\text{CO},\ \text{CO}_2$
4. D.
   $\text{N}_2\text{O}_4,\ \text{N}_2\text{O}_5$

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1. A.
   $NO, NO_2$
2. B.
   $CO, CO_2$
3. C.
   $H_2O, H_2O_2$
4. D.
   $Na_2S, NaF$

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